<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="mouseleaveTypeNav" @mouseenter="SearchEnter">
        <h2 class="all">全部商品分类</h2>
        <!-- 三联商品分类 -->
        <transition name="sort">
          <div class="sort" v-show="show">
            <div class="all-sort-list2">
              <!-- 一级导航 -->
              <div
                class="item bo"
                :class="{
                  curActiveTypeNav: currentActiveTypeNavIndex == index,
                }"
                v-for="(c1, index) in TypeNavList"
                :key="c1.categoryId"
                @mouseenter="mouseenterTypeNav(index)"
                @click="gosearch($event)"
              >
                <h3>
                  <a
                    :data-categoryName="c1.categoryName"
                    :data-category1Id="c1.categoryId"
                    >{{ c1.categoryName }}</a
                  >
                </h3>
                <!-- 二级导航 -->
                <div
                  class="item-list clearfix"
                  :style="{
                    display:
                      currentActiveTypeNavIndex == index ? 'block' : 'none',
                  }"
                >
                  <div class="subitem">
                    <dl
                      class="fore"
                      v-for="c2 in c1.categoryChild"
                      :key="c2.categoryId"
                    >
                      <dt>
                        <a
                          :data-categoryName="c2.categoryName"
                          :data-category2Id="c2.categoryId"
                          >{{ c2.categoryName }}</a
                        >
                      </dt>
                      <dd>
                        <!-- 三级导航 -->
                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                          <a
                            :data-categoryName="c3.categoryName"
                            :data-category3Id="c3.categoryId"
                            >{{ c3.categoryName }}</a
                          >
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>

      <!-- 横栏导航 -->
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>
            
            
<script>
import { mapState } from "vuex";
import throttle from "lodash/throttle";

export default {
  name: "TypeNav",

  data() {
    return {
      currentActiveTypeNavIndex: -1,
      show: true,
    };
  },

  mounted() {
    if (this.$route.path !== "/home") this.show = false;

    //获取列表数据
    // this.$store.dispatch("homeModule/getTypeNavList");  每次进入导航都创建组件 发送请求 性能不好
    //可以在根组件发起请求获取
  },
  computed: {
    ...mapState({ TypeNavList: (state) => state.homeModule.TypeNavList }),
  },
  // props: ['show'],
  methods: {
    //鼠标进入三联导航项目
    mouseenterTypeNav: throttle(function (TypeNavItemIndex) {
      this.currentActiveTypeNavIndex = TypeNavItemIndex;
    }, 50),

    // 节流实现
    // if(this.flag){
    //   setTimeout(() => {
    //     this.currentActiveTypeNavIndex = TypeNavItemIndex;
    //     this.flag=true
    //   }, 50);

    //   this.flag=false
    // }

    //鼠标离开三联导航项目
    mouseleaveTypeNav() {
      this.currentActiveTypeNavIndex = -1;

      if (/\/search/.test(this.$route.path)||/\/detail/.test(this.$route.path)) {
        this.show = false;
      }
    },

    //导航至类目
    gosearch(e) {
      //dataset里存着自定义属性
      //如果params存在
      if (this.$route.params) {
        //解构出对应的分类名和分类id
        //#region
        const { categoryname, category1id, category2id, category3id } =
          e.target.dataset;
        // 解决第一个问题，如何知道点击的就一定是相应的标签 只要有我们绑定的categoryname属性 那么就是a标签
        if (categoryname) {
          //   // 解决第二个问题 如何知道点击的是几级分类
          let location = { name: "search", query: { categoryName:categoryname },params:this.$route.params };
          if (category1id) {
            location.query.category1Id = category1id;
          } 
          if (category2id) {
            location.query.category2Id = category2id;
          } 
          if (category3id){
            location.query.category3Id = category3id;
          }
          this.$router.push(location);
        }
        //#endregion
      }
    },

    //search组件进入事件
    SearchEnter() {
      // console.log(this.$route.path.test(/\/search/));

      if (/\/search/.test(this.$route.path)||/\/detail/.test(this.$route.path)) {
        this.show = true;
      }
    },
  },
};
</script>
            
            
<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        // 当前激活的三联导航样式
        .curActiveTypeNav {
          background-color: rgb(173, 206, 244);
        }

        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            &:hover {
              cursor: pointer;
            }

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          // &:hover {
          //   .item-list {
          //     display: block;
          //   }
          // }
        }
      }
    }

    // sort过渡效果

    // sort进入
    .sort-enter,
    .sort-leave-to {
      height: 0px;
      opacity: 0;
    }
    //sort进入完成
    .sort-enter-to,
    .sort-leave {
      height: 461px;
      opacity: 1;
    }
    //sort进入过程
    .sort-enter-active,
    .sort-leave-active {
      transition: all 0.3s ease;
    }
  }
}
</style>